JP2008187706A - 高速光伝送のためのビットインターリーブされたldpc符号化変調 - Google Patents
高速光伝送のためのビットインターリーブされたldpc符号化変調 Download PDFInfo
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- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03171—Arrangements involving maximum a posteriori probability [MAP] detection
Abstract
【解決手段】送信機は、m個の情報源からソースビットストリームを受信するように構成された複数の符号化器を含み、複数の符号化器のそれぞれは、kが情報ビットの数、nが符号語長であるとして、符号化率r=k/nの同一の(n,k)低密度パリティチェック(LDPC)符号を含む。インターリーバが、複数の符号化器からm個の行方向符号語を収集するように構成され、マッパが、インターリーバから列方向に一度にmビットを受信し、M元信号コンステレーション点を求めるように構成される。変調器が、伝送速度Rs/r(Rsはシンボルレート、rは符号化率)で、マッパの出力に基づいて光源を変調するように構成される。受信機ならびに送信方法及び受信方法も開示される。
【選択図】図1
Description
Claims (22)
- m個の情報源からソースビットストリームを受信するように構成された複数の符号化器であって、前記複数の符号化器のそれぞれは、kが情報ビットの数、nが符号語長であるとして、符号化率r=k/nの同一の(n,k)低密度パリティチェック(LDPC)符号を含んでいる複数の符号化器と、
前記複数の符号化器からm個の行方向符号語を収集するように構成されたインターリーバと、
前記インターリーバから列方向に一度にmビットを受信し、M元信号コンステレーション点を求めるように構成されたマッパと、
Rsがシンボル伝送速度、rが符号化率であるとして、伝送速度Rs/rで、前記マッパの出力に基づいてソースを変調するように構成され、それぞれの最初の伝送間隔でデータフェーザが伝送される変調器と、
を備える送信機。 - 集約伝送速度が少なくとも100Gb/sである請求項1に記載の送信機。
- 前記複数のLDPC符号化器は、並列に構成されたm個の符号化器を含む請求項1に記載の送信機。
- 前記複数のLDPC符号化器はm個未満の符号化器を含み、前記複数の符号化器が前記インターリーバに対して多重化されている請求項1に記載の送信機。
- 前記マッパが、M元差動位相シフトキーイング(DPSK)を提供するように構成されている、請求項1に記載の送信機。
- M=2mである請求項5に記載の送信機。
- 前記マッパは、Grayマッパ、アンチGrayマッパ、及びナチュラルマッパのうちの1つを含む、請求項1に記載の送信機。
- kiがマルチレベル符号化の場合のi番目成分LDPC符号の次元であるとして、mがΣki/nを超える、請求項1に記載の送信機。
- 入力信号の各部分を分解するように構成された受信機入力と、
信号の前記各部分を受け取り、前記入力信号についてのシンボル確率を求めるように構成されたデマッパと、
和積方法を実行する複数の復号器と、
を備え、各復号器が、低密度パリティチェック(LDPC)符号に基づいて実装され、それによってすべての復号器が同一となり、前記復号器からの外因性確率の形態での反復的フィードバックが容易となり、前記反復的フィードバックが前記デマッパに供給され、それによって前記外因性確率の反復がビット誤り率性能を改善する、受信機。 - 前記外因性確率は、前記LDPC復号器の外因性対数尤度比(LLR)を使用することによって更新される事前シンボル確率を含む、請求項9に記載の受信機。
- 前記デマッパに接続され、軟反復的復号のためにビット対数尤度比(LLR)を計算するように構成されたビットLLR計算モジュールをさらに備える、請求項9に記載の受信機。
- 前記デマッパは事後確率(APP)デマッパを含む請求項9に記載の受信機。
- 有効な符号語が求められるまで、または所定の反復数に達するまで、前記反復的フィードバックが続行される請求項9に記載の受信機。
- kが情報ビットの数、nが符号語長であるとして、m個の情報源からのソースビットストリームを、符号化率r=k/nの同一の(n,k)低密度パリティチェック(LDPC)符号を含む複数の符号化器で符号化することと、
前記複数の符号化器から収集されたm個の行方向符号語をインターリーブすることと、
前記インターリーブから列方向に一度にmビットをマッピングし、M元信号コンステレーション点を求めることと、
Rsがシンボル伝送速度であり、rが符号化率であり、Rbが情報源Rb当たりのビットレートであるとして、伝送速度Rs/rかつ集約レートmRbで、前記マッパの出力に基づいて光源を変調するように差動位相シフトキーイングすることと、
を含む、データを送信する方法。 - 前記伝送速度が少なくとも100Gb/sである請求項14に記載の方法。
- マッピングすることが、インターリーバからのmビットに基づいて差動位相を選択し、M元(M=2m)差動位相シフトキーイング(DPSK)を提供する、請求項14に記載の方法。
- 入力信号を受信し、前記入力信号の各部分を分解することと、
信号の前記各部分をデマッピングし、前記入力信号についてのシンボル確率を求めることと、
それぞれの復号器が同一の低密度パリティチェック(LDPC)符号を使用して実装されている複数の同一の復号器を用いて、和積方法でシンボルを復号することと、
ビット誤り率性能を改善するように外因性確率の反復が使用されるように、前記復号器とデマッパとの間で前記外因性確率を反復的にフィードバック及び転送することと、
を含む、データを受信する方法。 - ビット対数尤度比(LLR)がシンボル確率から計算される請求項17に記載の方法。
- 前記ビットLLRが、和積方法に基づいて軟反復LDPC復号器によって処理される、請求項18に記載の方法。
- デマッピングが、事後確率(APP)デマッピングに基づいて実施される、請求項17に記載の方法。
- APPデマッパが、チャネルサンプル、ヒストグラム推定シンボル確率密度関数、及びLDPC復号器外因性LLRを処理し、次回の反復のための事後シンボル確率を求める、請求項20に記載の方法。
- 有効な符号語が得られるまで、または所定の反復数に達するまで、前記外因性確率がLDPC復号器と前記デマッパとの間で両方向に反復される、請求項17に記載の方法。
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US11/950,757 US7992070B2 (en) | 2006-12-27 | 2007-12-05 | Bit-interleaved LDPC-coded modulation for high-speed optical transmission |
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